| 摘要 |
In a thyristor 20, a ring-shaped glass member 40 is affixed to a first major surface 23 of the body of semiconductive material to form a seal protecting the PN junction 21 between the first emitter region 24 and the first base region 26; and a second annular shaped glass member 46 is affixed to the edge of the body of semiconductive material to form a seal protecting the PN junctions formed between the first base region 26 and the second base region 28 and between the second base region 28 and the second emitter region 30. The ring-shaped glass members 40, 46 may be formed by heating glass preforms in an atmosphere comprising a predetermined mixture of nitrogen and water vapor to cause the glass preforms to soften and fuse to the surfaces of the body of semiconductive material. <IMAGE> |
